Regrowth of arsenate-sulphate efflorescences on processing plant walls at the Ottery arsenic-tin mine, New South Wales, Australia: implications for arsenic mobility and remediation of mineral processing sites.

Brickwork columns within As condenser buildings are coated primarily with gypsum (CaSO4·2H2O) and contain approximately 1-5 wt% As, but more sheltered columns are associated with efflorescences rich in arsenolite and claudetite (polymorphs of As2O3) and contain up to 70-80 wt% As. The efflorescences within the Ottery condensers commonly contain minor quartz, feldspars, and two uncharacterised phases, including a K-Al-As phase and a Ca-Na-K-Al-F-As phase that are likely similar to previously reported phases from an As processing site in Cornwall, UK. SEM imaging indicates that the weathering of mortar and bricks provides a source of cations for efflorescence formation, with grains of more resistant minerals (e.g., quartz) incorporated into the efflorescences. Arsenic does not appear to substitute significantly for S in gypsum but instead is generally hosted in Al, Na, Ca and Fe-bearing arsenate minerals in weathered efflorescences and, in small grains of arsenolite in pore spaces within the brickwork, indicating that the bricks are a potentially long-lived source of As. The efflorescences on exposed columns at Ottery also regrow within 12 months after removal, releasing stored arsenic from the brickwork and causing a cyclical degradation of the buildings. Results indicate that brickwork buildings at mine sites like Ottery initially act as significant sinks for As within arsenolite. Over time, this As can become mobilised by rainfall to form arsenate-sulphate efflorescences, which gradually become more sulphate-rich as the arsenate minerals are removed by weathering. Thus, remediation efforts at abandoned, As-bearing processing buildings, such as those at Ottery, should focus on preventing water contact with bricks and mortar within processing buildings as well as efflorescences.
Brickwork columns within As condenser buildings are coated primarily with gypsum (CaSO4·2H2O) and contain approximately 1-5 wt% As, but more sheltered columns are associated with efflorescences rich in arsenolite and claudetite (polymorphs of As2O3) and contain up to 70-80 wt% As. The efflorescences within the Ottery condensers commonly contain minor quartz, feldspars, and two uncharacterised phases, including a K-Al-As phase and a Ca-Na-K-Al-F-As phase that are likely similar to previously reported phases from an As processing site in Cornwall, UK. SEM imaging indicates that the weathering of mortar and bricks provides a source of cations for efflorescence formation, with grains of more resistant minerals (e.g., quartz) incorporated into the efflorescences. Arsenic does not appear to substitute significantly for S in gypsum but instead is generally hosted in Al, Na, Ca and Fe-bearing arsenate minerals in weathered efflorescences and, in small grains of arsenolite in pore spaces within the brickwork, indicating that the bricks are a potentially long-lived source of As. The efflorescences on exposed columns at Ottery also regrow within 12 months after removal, releasing stored arsenic from the brickwork and causing a cyclical degradation of the buildings. Results indicate that brickwork buildings at mine sites like Ottery initially act as significant sinks for As within arsenolite. Over time, this As can become mobilised by rainfall to form arsenate-sulphate efflorescences, which gradually become more sulphate-rich as the arsenate minerals are removed by weathering. Thus, remediation efforts at abandoned, As-bearing processing buildings, such as those at Ottery, should focus on preventing water contact with bricks and mortar within processing buildings as well as efflorescences.